/** Proofs GPU - Space and Time's cryptographic proof algorithms on the CPU and GPU.
 *
 * Copyright 2023-present Space and Time Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include "sxt/base/error/assert.h"
#include "sxt/base/macro/cuda_callable.h"

namespace sxt::algb {
//--------------------------------------------------------------------------------------------------
// identity_mapper
//--------------------------------------------------------------------------------------------------
template <class T> class identity_mapper {
public:
  using value_type = T;

  identity_mapper() noexcept = default;

  CUDA_CALLABLE explicit identity_mapper(const T* data) noexcept : data_{data} {}

  CUDA_CALLABLE void map_index(T& val, unsigned int index) const noexcept { val = data_[index]; }

  CUDA_CALLABLE const T& map_index(unsigned int index) const noexcept { return data_[index]; }

private:
  const T* data_ = nullptr;
};
} // namespace sxt::algb
